Method of making bearing bushings



Feb. 4, 1941. F. BIEDERMANN 2,230,637

METHOD OF MAKING BEARING BUSHINGS Filed NOV. 16, 1938 EEfeder- F Patented Feb. 4,,1941

PATENT OFFICE 2,230,637 METHOD OF MAKING BEARING BUSHINGS Felix Biedermann, Berlin-Wei ssensee, Germany, assignor-to Admos Bleibronze Dr. Springorum & Co. Kom.-Ges., Berlin-Oberschone welde, Germany Application November 16, 1938, Serial No. 240,849 In Germany December 15, 1937 1 Claim. (01. 29149.5) My invention relates to bearings, and more cording to my invention is illustrated by way of particularly to bearings with an antiiriction linexample. ing, such as are used for shafts revolving at very In the drawing high speed in airplane and other engines. Figs. 1 and 2 are cross-sections of divided The following method is usually employed for blanks.

making bearings of this type:

- A tubular blank of ferrous metal, 1. e., of cast iron, wrought iron, or steel, is lined on its inner and/or outer side with an antifriction metal,

preferably lead bronze, containing 60 to 80 parts of copper, and 40 to 20 parts of lead. The lining is preferably applied in a permanent mold, on the inner or outer side of the blank, or on both sides, as required, and the blank is quenched immediately after the casting of the lining to prevent segregation of the lead. The blank is then divided longitudinally, and its two halves are machined.

It is obvious that the two halves of a bearing must be full semi-cylinders, and it is as obvious that only one of the halves can fulfill this condition, since part of the material is changed into sawing chips when the blank is divided, and there must be a machining allowance on that half which is to be used. It follows,'therefore, thatv in this method the waste is excessive, since each blank supplies but one semi-cylinder, and the remainder of the blank which is almost as large as the semi-cylinder, hasonly scrap value, apart from the necessity of recovering the expensive lining from the part going to waste. It is obvious that under these conditions the price of bearings is high and the demand of material is beyond proportion.

It is an object of my invention to provide a method in which 'these' drawbacks are eliminated and two fully semi-cylindrical and perfectly true bearing halves are produced from a hollow cylindrical blank.

To this end, I shape the blank into-two hollow semi-cylinders who'se axes are arranged in equidistant relation at opposite sides of the blanks axis, and remove the material which is between the parallel central plane of the two semi-cylinders.

The inside and outside diameters of the blank are somewhat in excess of the sum of the cor,- responding radii-of the finished bearing and the extra material thus obtained represents the. material which is changed into chips, and the machining allowance on. the mating ends of the semi-cylinders obtained.

In the accompanying drawing, a bearing made in conformity with the old method is illustrated by way of explanation, and a bearing made ac- Fig. 3 is a ero conformity with my method.

Fig. 4 is a cross-section of the finished hearing obtained.

In the old method, is turned to cylindrical shape on a lathe before the lining is made, as shown in Figs. 1 and 2.

When this blank is divided by removing the material at 5, it is obvious that only one of the 2 in Fig. 2 is a perfect semi-cylinder while the other halves. 3 in Fig. l and 4 in Fig. 2, are minus the material removed, and minus the ma chlning allowance, as indicated, much exag- 5 -section of a blank made in the hollow cylindrical blank 10 halves, that is, the half I in Fig. 1 and the half 15 gerated, at 5. Only the semi-cylinders l and 2 20 are suitable for making up a bearing together, and the parts 3 and 4 go to waste. 7

According to the invention, the blank is not turned to cylindrical shape. The blank as shown in dotand-dash lines in Fig.v whose axis is 6 and whose outside radius is B. This blank is turned to form the intermediate product illustrated in Fig. 3 which is defined by the intersection, in the planeor the axis 6. of two equi-distant relation at opposite sides 0! the blank axis 6, and whose radii are smaller than the corresponding radii of the blank for the distance 1-8. By these means, a perfect semicylinder 9 is formed about the axis I, and another perfect semi-cylinder III is formed about the axis 8. The letter 1' designates the inside radius of the two cylinders. The two semicylinders 9 and III intersect in the plane of the blank axis 6 and form intermediate portions ll whose width I2 is equal to the distance 1-8. The intermediate portions II are removed by sawing, and the two complete and true semicylinders are abutted as shown in Fig. 4 to form a circular bearing. An. antiiriction lining, not shown; may be provided as described.

It will be understood that in the manner, de-

scribed, waste is reduced to a minimum, and it 3, is a cylinder 25 -cylinders whose axes I and 8 are arranged in is situated outside the longitudinalmiddle axis intermediate material, withantifriction mateoi! said member to form two hollow s'emi-c'ylinrial, and removing the material intermediate drical members connected together by intersaid hollow semi-cylindrical members to obtain mediate material, the axesoi' the semi-cylindrical two equal semi-cylindrical members formingtomembers being arranged in equidistant relation gether the bushings for use in a compound bearat opposite sides or the original axis or said ing.

hollow member, lining said member, consisting of the two semi-cylindrical parts connected by the v FELIX BIEDERMANN- 

